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/* Copyright (C) 2013-2014 TU Dortmund
 * This file is part of LearnLib, http://www.learnlib.de/.
 * 
 * LearnLib is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 3.0 as published by the Free Software Foundation.
 * 
 * LearnLib is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with LearnLib; if not, see
 * http://www.gnu.de/documents/lgpl.en.html.
 */
package de.learnlib.oracles;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.ParametersAreNonnullByDefault;

import de.learnlib.api.SUL;
import de.learnlib.api.SULException;
import de.learnlib.statistics.Counter;
import de.learnlib.statistics.StatisticSUL;

@ParametersAreNonnullByDefault
public class SymbolCounterSUL implements StatisticSUL {
	
	private final SUL sul;
	private final Counter counter;

	public SymbolCounterSUL(String name, SUL sul) {
		this.sul = sul;
		this.counter = new Counter(name, "symbols");
	}

	/* (non-Javadoc)
	 * @see de.learnlib.api.SUL#pre()
	 */
	@Override
	public void pre() {
		sul.pre();
	}


	/* (non-Javadoc)
	 * @see de.learnlib.api.SUL#post()
	 */
        @Override
	public void post() {
		sul.post();
	}

	/* (non-Javadoc)
	 * @see de.learnlib.api.SUL#step(java.lang.Object)
	 */
	@Override
	@Nullable
	public O step(@Nullable I in) throws SULException {
		counter.increment();
		return sul.step(in);
	}

	/* (non-Javadoc)
	 * @see de.learnlib.statistics.StatisticSUL#getStatisticalData()
	 */
	@Override
	@Nonnull
	public Counter getStatisticalData() {
		return counter;
	}
	
	

}